import { inject } from '@angular/core';
import { ResolveFn } from '@angular/router';

import { Bill } from './bill';
import { VoucherService } from './voucher.service';

export const billResolver: ResolveFn<Bill> = (route) => {
  const tableId = route.queryParamMap.get('table');
  const guestId = route.queryParamMap.get('guest');
  const voucherId = route.queryParamMap.get('voucher');
  const billId = route.queryParamMap.get('bill');
  if (billId !== null) {
    return inject(VoucherService).getFromBill(billId);
  }
  if (tableId !== null) {
    return inject(VoucherService).getFromTable(tableId as string, voucherId, guestId);
  }
  if (voucherId !== null) {
    return inject(VoucherService).getFromId(voucherId);
  }
  throw new Error('Unable to get bill');
};